In this episode of Run the Riot, we reconnect with Peter Defty, a pioneering force behind the fat-adapted movement in endurance sports. Peter is the man behind Vespa and OFM (Optimized Fat Metabolism), and today, he shares powerful insights into how ultrarunners can unlock performance, recover faster, and sustain longevity by training their bodies to burn fat as a primary fuel source.

We dive into:

Peter’s first 100-miler at the hottest Western States ever recorded 🌡️

How Vespa was inspired by a Japanese study of a wasp species

The science behind OFM and how it improves fat utilization

Why many athletes suffer from GI issues—and how OFM can solve them

Why it’s not about keto or carbs—it’s about balance and metabolic capacity

Practical advice for those looking to transition to fat-adapted running

The real cost of "science-backed" sports nutrition and how to cut out 75+ lbs of sugar annually

How Vespa and OFM have helped elite athletes like Jeff Browning, Peter Mortimer, and Andrea Moore thrive in the sport for years

Whether you’re an ultrarunning veteran or just starting to explore performance nutrition, this episode is packed with science, stories, and real-world results.

Show notes: http://www.theriot.run/peterd